Hielm



UNITED STATES PATENT FFKJE.

LUDWIG BiiitRNIIIELM, or s'rocKnoLu, NDnUcrs'r FERNANDIQR, or Ki'iRFsTA, SWEDEN.

QUICK-MATCH.

S?ECIFICATION forming part of Letters Patent No. 442,164, dated December 9, 1890. Application filed July 7 1890. Serial No. 358,001. (No specimens.) Patented in Sweden December 3, 1889, Ho. 2,328.

To all whom it may concern:

Be it known that .we, LUDWIG BZULRN- HI ELM, lieutenant-colonel, a subject of the King of Sweden, and a resident of Stockholm,

Sweden, and AUGUST FERNANDER, engineer,

a subject of the King of Sweden, and a resident of Kiirfsta, county of Westernorrland, Sweden, have invented an Improved Quick- Match, (for which we have obtained a Swedish patent, No. 2,328, dated December 3,-1 8S9,)'

of which the following is a specification This invention relates to a quick-match convenient to mining and other blasting purposes, as well under as above the watcr,wh ich quick-match, compared with the common one,

has the advantage of giving'less smoke, never missing fire, being easily ignitible, perfectly water-proof, and burning with a constant sp ed, which in manufacturing .lhe. quickmatch may be determined within very large limits. The quick-match hitherto used for this purpose consists, as known, of a core'of gunpowder or of a cotton twist impregnated such manufacture of explosives as great an explosive power as possible is in view in the present invention, on the contrary, the principal aim is to obtain a quiet, uniform, and slow burning, which may be effected by supplying a sufiicicnt quantity of oxygen and engendering as great a gas-pressure as is requisite for displacing the envelope.

According to our invention the core of the quick-match consists of a loose cotton twist of so-called-wick-yarn boiled in a 'solution of chlorate of potassium and nitrate of potassium. To one kilogram cellulose is taken about 1.5 kilogram chlorate-of potassium and nitrate of potassium together, however, not more than two hundred and fifty grains of the latter salt. In order to have the quickqnatch as free from smell and smoke as possible, there is added eight to fourteen percent. yellow prussiate of potash, by' which the free chlorine is bound. The cottontwist having thus been made explosive, it is dried carefully, submerged in'a collodion bath, and then again dried, and in this way it is contracted to a very compact mass,

which, being ignited, burns slowly, even as many ways the explosive technics have already proved; but its collodionating is, as far as we know, novel and indispensable for the purpose in view. 1

Having now particularly described and ascertained the nature'of th'isinvention and in what manner the same is to be performed,we declare that What we claim is-.

An improved quick-match consisting of a core of twisted cotton yarn impregated with a solution of chlorate of potassium and nitrate of potassium, to which is added yellow prussiatc of potash, and coated with collodion and directly surrounded with an envelope of asphalt dissolved in linseed-oil or another fatoil, to which likewise is added some salts of protoxide of manganese and of talc and sulphur.

In testimony whereof we have signed our names to this specification in the prescnceof two subscribing witnesses.

LUDWIG BAA'RNHIELM. AUGUS" FERNANDER.

Witnesses:

NERE A. ELFWING,

J OHN EDBERG. 

